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DE?? ?? ??
?? 18??? ?? ?? ??? ??? ??? ??.
?? ???? ?? ?? ??? ??? ??? ??? ????: ??? ?? ??, ??, ??? ? ??? ??, ?? ?? ? ??, ?? ??, ?? ?? ???.
Group Standards of the People's Republic of China, ?? ?? ??
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ?? ?? ??
Professional Standard - Petroleum, ?? ?? ??
PL-PKN, ?? ?? ??
(U.S.) Ford Automotive Standards, ?? ?? ??
Professional Standard - Non-ferrous Metal, ?? ?? ??
SE-SIS, ?? ?? ??
Professional Standard - Aviation, ?? ?? ??
Military Standard of the People's Republic of China-General Armament Department, ?? ?? ??
Professional Standard - Chemical Industry, ?? ?? ??